Add Ed448 tests

Reviewed-by: NBernd Edlinger <bernd.edlinger@hotmail.de>
(Merged from https://github.com/openssl/openssl/pull/5105)

crypto/ec/curve448/curve448_lcl.h

@@ -5,3 +5,23 @@ int X448(uint8_t out_shared_key[56], const uint8_t private_key[56],
 
 void X448_public_from_private(uint8_t out_public_value[56],
                               const uint8_t private_key[56]);
+
+int ED448_sign(uint8_t *out_sig, const uint8_t *message, size_t message_len,
+               const uint8_t public_key[56], const uint8_t private_key[56],
+               const uint8_t *context, size_t context_len);
+
+int ED448_verify(const uint8_t *message, size_t message_len,
+                 const uint8_t signature[112], const uint8_t public_key[56],
+                 const uint8_t *context, size_t context_len);
+
+int ED448ph_sign(uint8_t *out_sig, const uint8_t *message, size_t message_len,
+                 const uint8_t public_key[56], const uint8_t private_key[56],
+                 const uint8_t *context, size_t context_len);
+
+
+int ED448ph_verify(const uint8_t *message, size_t message_len,
+                   const uint8_t signature[112], const uint8_t public_key[56],
+                   const uint8_t *context, size_t context_len);
+
+void ED448_public_from_private(uint8_t out_public_key[56],
+                               const uint8_t private_key[56]);

crypto/ec/curve448/eddsa.c

@@ -14,6 +14,7 @@
  */
 #include <openssl/crypto.h>
 
+#include "curve448_lcl.h"
 #include "word.h"
 #include "ed448.h"
 #include "shake.h"
@@ -326,3 +327,52 @@ decaf_error_t decaf_ed448_verify_prehash (
     
     return ret;
 }
+
+int ED448_sign(uint8_t *out_sig, const uint8_t *message, size_t message_len,
+               const uint8_t public_key[56], const uint8_t private_key[56],
+               const uint8_t *context, size_t context_len) {
+
+    decaf_ed448_sign(out_sig, private_key, public_key, message, message_len, 0,
+                     context, context_len);
+
+    return 1;
+}
+
+
+int ED448_verify(const uint8_t *message, size_t message_len,
+                 const uint8_t signature[112], const uint8_t public_key[56],
+                 const uint8_t *context, size_t context_len) {
+    return decaf_ed448_verify(signature, public_key, message, message_len, 0,
+                              context, context_len) == DECAF_SUCCESS;
+}
+
+int ED448ph_sign(uint8_t *out_sig, const uint8_t *message, size_t message_len,
+                 const uint8_t public_key[56], const uint8_t private_key[56],
+                 const uint8_t *context, size_t context_len) {
+    (void)out_sig;
+    (void)message;
+    (void)message_len;
+    (void)public_key;
+    (void)private_key;
+    (void)context;
+    (void)context_len;
+    return 0;
+}
+
+
+int ED448ph_verify(const uint8_t *message, size_t message_len,
+                   const uint8_t signature[112], const uint8_t public_key[56],
+                   const uint8_t *context, size_t context_len) {
+    (void)message;
+    (void)message_len;
+    (void)signature;
+    (void)public_key;
+    (void)context;
+    (void)context_len;
+    return 0;
+}
+
+void ED448_public_from_private(uint8_t out_public_key[56],
+                               const uint8_t private_key[56]) {
+    decaf_ed448_derive_public_key(out_public_key, private_key);
+}